Defending champions Novak Djokovic and Serena Williams have been confirmed as the top seeds for this year's Wimbledon tournament.

Djokovic heads into the event, which begins on Monday June 27, bidding for his fourth Wimbledon crown and his third in a row.

He became the first man in nearly 50 years to win four consecutive major championships when he won the French Open earlier this month.

Djokovic heads to London as the only man since Jim Courier in 1992 to win the first two majors of the year, but will face stiff competition from second seed Andy Murray, with the world number two keen to avenge his losses against Djokovic at this season's Australian and French Open finals.

Agnieszka Radwanska and Angelique Kerber round off the top four seeds, while the likes of Victoria Azarenka, Simona Halep and two-time Wimbledon champion Petra Kvitova will all fancy their chances of preventing Williams from tying with Graf.

Svetlana Kuznetsova is the highest ranked Russian player in the competition. The 14th seed has reached the last eight on three previous occasions in 2003, 2005 and 2007.

The winners of this year's tournaments will receive $2.93 million as Wimbledon maintains its title as tennis's best-paying competition.

With security fears high around Europe following the attempted terrorist attack on the France against Germany football match in Paris last November, Wimbledon will be patrolled by armed police.

Around 500,000 fans will flock to South West London during the two-week event and Wimbledon bosses are keen to ensure the tournament passes off without incident.